Two spheres with uniform surface charge density, first with a radius of 7.5cm and the second with a radius of 4.5cm , are separated by a center-to-center distance of 33cm. The spheres have a combined charge of + 55\mu {\rm{C}} and repel one another with a force of 0.65N . Assume q1>q2.
A) What is the surface charge density on the first sphere?
B) What is the surface charge density on the second sphere?